spurious(?) userland malloc/mmap failure

From: Eric van Gyzen <eric_at_vangyzen.net>
Date: Mon, 13 Jan 2020 10:58:33 -0600
While running head r356494, my buildworld just failed due to an 
apparently spurious userland malloc/mmap failure.

===> usr.bin/finger (all)
objcopy: elf_update() failed: I/O error: Cannot allocate memory
--- all_subdir_usr.bin/finger ---
*** [all_subdir_usr.bin/finger] Error code 2

I ran 'make' in usr.bin/finger, and objcopy succeeded.  I then ran "make 
buildenv" followed by "make clean" and "make" in usr.bin/finger, which 
also worked.

buildworld was running with -j8, and a few C++ things were building 
concurrently, such as googletest and usr.bin/clang/llvm-objdump, so 
maybe the machine was under memory pressure.  It's a bhyve VM with 8 
CPUs and 8 GB RAM.

The full build log is:


Received on Mon Jan 13 2020 - 15:58:46 UTC

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